CN105841825B - A kind of wavelength resolution monitoring method based on liquid crystal on silicon - Google Patents
A kind of wavelength resolution monitoring method based on liquid crystal on silicon Download PDFInfo
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- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 62
- 229910052710 silicon Inorganic materials 0.000 title claims abstract description 59
- 239000010703 silicon Substances 0.000 title claims abstract description 59
- 238000012544 monitoring process Methods 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 title claims abstract description 16
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 58
- 230000003287 optical effect Effects 0.000 claims abstract description 14
- 230000011664 signaling Effects 0.000 claims description 9
- 230000008859 change Effects 0.000 claims description 5
- 238000004458 analytical method Methods 0.000 abstract description 9
- 230000010287 polarization Effects 0.000 abstract description 7
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J9/00—Measuring optical phase difference; Determining degree of coherence; Measuring optical wavelength
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Abstract
The wavelength resolution monitoring method based on liquid crystal on silicon that the invention discloses a kind of.Based on liquid crystal on silicon under same bias voltage, there is the characteristic of different phase-modulations to different wave length incident light, analysis and monitoring are realized to the optical signal in liquid crystal on silicon wavelength wavelength operating range, and it can be under conditions of lambda1-wavelength be unknown, the wavelength is measured, and the resolving accuracy of wavelength can be improved with the raising of phase-modulation precision.Element of the present invention is few, system structure simple and compact, it is not high to the collimation requirements of light path, coupling without harsh light path can carry out the resolution of wavelength with complex operations, and there is the characteristic unrelated with incident light polarization state, while telling wavelength, moreover it is possible to be measured to the polarization state of incident beam, the scope of application is wider.
Description
Technical field
The invention belongs to wavelength resolutions and monitoring technical field, more particularly, to a kind of wavelength based on liquid crystal on silicon
Monitoring method is differentiated, it can be according to service band (420~650nm of visible light wave range, the near-infrared light waves of used liquid crystal on silicon
Section 650~1100nm and 1400~1700nm of communication band etc.), to the optical signal under liquid crystal on silicon service band into traveling wave
It is long to differentiate and monitor.
Background technology
Wavelength is one of essential characteristic of light, and wavelength resolution technology has critically important application in many situations.In gas
As learning field, according to mist and haze to the different scattering of visible light and absorbent properties, by telling specific wavelength, can by mist and
Haze distinguishes；In bio-science field, it usually needs the wavelength size of detection object reflected light determines specific wavelength, analyzes
Material composition；In fiber optic communication field, by specific wavelength analysis, in wavelength multiplexing device, the wave that breaks down can be identified
Long specific location.In optical communication field, the application of wavelength analysis and monitoring is more and more extensive.Traditional measurement, analysis wavelength
Method include using newton it is around-France, two-slit diffraction method, body grating etc. measures.However these methods want the collimation of light path
It asks higher, and is required for through manual or Mechanical course, often measuring a wavelength will once be adjusted, and step is numerous
Trivial, the testing time is long, while apparatus structure is complicated, expensive.
Invention content
For the disadvantages described above or Improvement requirement of the prior art, the present invention provides a kind of wavelength based on liquid crystal on silicon point
It distinguishes monitoring method, based on liquid crystal on silicon under same bias voltage, there is different phase-modulations to different wave length incident light
Characteristic realizes analysis and monitoring to the optical signal in liquid crystal on silicon wavelength wavelength operating range, and can be unknown in lambda1-wavelength
Under the conditions of, which is measured.
To achieve the above object, the present invention provides a kind of the wavelength resolution monitoring method based on liquid crystal on silicon, feature
It is, includes the following steps：
(1) liquid crystal on silicon is utilized to receive known signal light of the wavelength in its operating wavelength range；
(2) analyzer is set on the output light path of liquid crystal on silicon, detects the light signal strength I exported by analyzer；
(3) the phase modulation values γ for adjusting liquid crystal on silicon, makes it change within the scope of 0 to 2 π, obtains multigroup corresponding with γ
Light signal strength；
(4) according to this multigroup light signal strength corresponding with γ, the maximum of points γ corresponding with minimum point of I is found out,
Its corresponding gray level value is obtained, and then the grey level that the two points are calculated is poor；
(5) in the operating wavelength range of liquid crystal on silicon, adjust known signal light wavelength, repeat step (3) and
(4), the grey level obtained under different wave length is poor；
(6) it utilizes liquid crystal on silicon to receive unknown signaling light of the wavelength in its operating wavelength range, repeats step (3)
(4), the grey level obtained under unknown signaling optical wavelength is poor, the grey level under the different wave length that control step (5) obtains
Difference obtains the wavelength of unknown signaling light, achievees the purpose that wavelength detecting.
Preferably, in the step (3), three groups of light signal strengths corresponding with γ are obtained；In the step (4), utilizeSolve the directions amplitude b and p and the side s in the directions amplitude a and s for obtaining the directions signal light p
To phase difference, and then the maximum of points γ corresponding with minimum point for obtaining I.
Preferably, in the step (4), according to this multigroup light signal strength corresponding with γ, signal light wavelength is drawn out
Under γ-I curves, find out the maximum of points γ corresponding with minimum point of I.
Preferably, the liquid crystal on silicon, reflective or transmission-type liquid crystal on silicon are suitable for the system.
In general, through the invention it is contemplated above technical scheme is compared with the prior art, have below beneficial to effect
Fruit：
1, according to the operating wavelength range of liquid crystal on silicon, the wavelength resolution task of light to be measured in respective range can be completed, i.e.,
Ultraviolet band, visible light wave range, infrared band even communication band can be differentiated, and can be carried with the raising of phase-modulation precision
The resolving accuracy of high wavelength.
2, compared with the technology of other resolution wavelength, element of the present invention is few, system structure simple and compact, and has and enter
The unrelated characteristic of polarization state is penetrated, the scope of application is wider.
3, the liquid crystal on silicon (LCOS) used in the present invention, is the relevant Spatial Phase Modulator part of a wavelength, silicon
The phase controlling of base fluid crystalline substance is executed by computer program, and precision is high and is easy to control, and automatic data collection processing accurately may be used
Letter.
4, the amplitude and phase value of incident light can be quantitatively found out during carrying out wavelength resolution and monitoring, so
While telling wavelength, moreover it is possible to be measured to the polarization state of incident beam.
5, the element introduced is few, not high to the collimation requirements of light path, the coupling without harsh light path and complex operations energy
The resolution of wavelength is carried out, it is simple and practical, and light path is once put up there is no need to be manually adjusted, and implements very square
Just.
Description of the drawings
Fig. 1 is the structure diagram of the wavelength resolution monitoring system based on liquid crystal on silicon of the embodiment of the present invention；
Fig. 2 is the flow diagram of the wavelength resolution monitoring method based on liquid crystal on silicon of the embodiment of the present invention.
Specific implementation mode
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.As long as in addition, technical characteristic involved in the various embodiments of the present invention described below
It does not constitute a conflict with each other and can be combined with each other.
As shown in Figure 1, the wavelength resolution monitoring system based on liquid crystal on silicon of the embodiment of the present invention includes：Liquid crystal on silicon,
Analyzer and optical detector, wherein the liquid crystal driver module under liquid crystal on silicon is controlled by computer drives.
Certain wavelength X1Under light sent out by light source after, by the modulating action of liquid crystal on silicon, change the polarization state of incident light.
In implementation process, with minimum phase-modulation precision (common LCOS can reach 1 ° or less), by 0 to 2 π continuous modulations
Component (herein vertically to polarize, being defined as p-polarization light) on some direction, a series of light intensity is obtained through detector
Angle value I, to draw out γ-I curves；According to the γ-I curves drawn out, light intensity maxima and minima point, Jin Erfen are found
Its corresponding modulation γ is not found out according to light intensity value, and finds out corresponding gray level value, calculates the gray scale electricity of two points
Adjustment.
By the operation principle of liquid crystal it is found that liquid crystal device is wavelength Sensitive Apparatus, i.e., the same load phase value is to difference
Wavelength can generate different phase-modulations.In the operating wavelength range of liquid crystal on silicon, change a length of λ of incident light wave2, repeat
Aforesaid operations can draw out another corresponding γ-I curve, and the grey level found out simultaneously under the wavelength is poor, thus obtains
Some row curves, achieve the effect that wavelength monitoring.
In the working range of liquid crystal on silicon, determines after a series of wavelength curves and obtain each with minimum wavelength interval
Grey level under wavelength is poor, and at this time again with unknown wavelength incident, γ-I curves are obtained after equally operating, and has obtained
Family of curves compareed the comparison of grey level difference (practical be), find corresponding to wavelength value, that is, incident light wave
Long value achievees the effect that differentiate wavelength.
Correspondingly, the wavelength resolution monitoring method based on liquid crystal on silicon of the embodiment of the present invention includes following step
Suddenly：
(1) liquid crystal on silicon is utilized to receive known signal light of the wavelength in its operating wavelength range；
(2) analyzer is set on the output light path of liquid crystal on silicon, is detected using optical detector (PD) and is exported by analyzer
Light signal strength I；
(3) the phase modulation values γ for adjusting liquid crystal on silicon, makes its consecutive variations within the scope of 0 to 2 π, obtains multigroup and γ
Corresponding light signal strength；
(4) according to this multigroup light signal strength corresponding with γ, the γ-I curves under signal light wavelength is drawn out, I is found out
Maximum of points γ corresponding with minimum point, obtain its corresponding gray level value, so be calculated the two point ashes
Spend level difference；
(5) in the operating wavelength range of liquid crystal on silicon, adjust known signal light wavelength, repeat step (3) and
(4), the grey level obtained under different wave length is poor；
(6) it utilizes liquid crystal on silicon to receive unknown signaling light of the wavelength in its operating wavelength range, repeats step (3)
(4), the grey level obtained under unknown signaling optical wavelength is poor, the grey level under the different wave length that control step (5) obtains
Difference obtains the wavelength of unknown signaling light, achievees the purpose that wavelength detecting.
The operation principle of the above method is described in detail below.
Carried out using Stokes vector and analyzed, the setting original directions incident light p and s amplitude is respectively a and b, and phase difference isThen the Stokes vector of incident light can indicate as follows：
By a Spatial Phase Modulator.We use liquid crystal on silicon herein, since it is a polarization sensitive device
Part can only generate the linearly polarized light on a certain specific direction the effect of phase-modulation, the i.e. slow-axis direction (definition of liquid crystal molecule
For the directions p polarised light).The phase delay of γ is generated to p light, the Muller matrix of liquid crystal on silicon is represented by：
Wherein, the phase γ loaded is related with driving voltage and wavelength to be measured.
An analyzer for deflecting the angles θ counterclockwise is placed between LCOS and optical detector, Muller matrix can indicate
At：
After the transmission of above-mentioned optical element, output intensity can be expressed as：
Sout=Tpolarizar(θ)MLCOS(γ)Sin (4)
Various pieces are substituted into, obtaining expression is：
The light intensity value that detector detects is：
Because the placed angle of analyzer is fixed, i.e. θ be it is known that in order to simplify calculate be convenient for theory analysis, enable θ=
45 °, therefore light intensity expression can be reduced to：
It is λ for centre wavelength0Liquid crystal on silicon, it is corresponding when driving voltage is U, and the thickness of liquid crystal molecule is D
Phase modulation values are：
According to Vcauchy dispersion formuia, refractive index and the relational expression of wavelength are under a certain specific driving voltage：
Therefore phase modulation values γ and on-load voltage U and wavelength X are all in relation to (conduct analysis herein, can be by square of wavelength
Item omits, and does approximate calculation), i.e.,：
Therefore measured performance number can be write as：
The meaning of formula (11) is that this is a cosine curve, when LCOS often loads a phase modulation values γ, optical detection
Device will detect a corresponding luminous intensity.Therefore, at least through three different γ and corresponding luminous intensity Idet, can
By solving equations, the unknown quantity of three expression incident light polarization states is found out：Amplitude a, b and phase differenceObtain light intensity value
Corresponding γ, calculates grey level difference accordingly when maximum or minimum.More accurate calculation is to utilize phasescan journey
Sequence apply phase modulation values, obtain under different wavelength Xs with its one-to-one light intensity value, according to the phase applied with
And corresponding intensity, an I- gamma curve is obtained, then data fitting is carried out by computer program, you can calculate ash at this time
Spend level difference.By changing wavelength, then the I- gamma curves at another different wave length can be obtained.It is inputted and is counted using automatic feedback
The phase modulation values and light intensity detection value of calculation machine, pass through Data Analysis Software, such as Matlab, so that it may to realize to each difference
The record of the grey level difference of wavelength.Since under the same driving voltage, LCOS generates different wave length optical signal different
Phase-modulation effect.
Formula (11) will be made to obtain discrimination between each wavelength curve, then to make the grey level corresponding to different wave length
Difference is not mutually equal.Wavelength resolution precision obtained by this covering device is discussed below.
It is λ for operating central wavelength0Liquid crystal on silicon, phase modulation values against drive load voltage linear become
Change.The operation wavelength of incidence wave ranging from liquid crystal on silicon is set, incident centre wavelength is λ0, institute is right when reaching maximum modulation phase
The grey level answered is m (if the phase mask signal of load is b position digital signals, m=2b), when LCOS do not power on (not plus
Carry voltage) when, the wavelength come to incidence does not have modulating action, and therefore, the relationship of wavelength interval and gray value can be write as (12)
It can obtain centre wavelength resolution ax λ0Relational expression with gray value m is (13)
From the above equation, we can see that being the liquid crystal on silicon of 1550nm, 9 input phase template number letters when selecting centre wavelength
Number, then it can obtain Δ λ0The resolving accuracy of=3nm.
When the liquid crystal on silicon operating wavelength range of selection is [λmin,λmax], centre wavelength λ0, the maximum of central wavelength
Phase modulation isUsing 9 phase mask digital signals, then maximum gradation value is m=29=512, it is understood by above-mentioned derivation
The resolution ratio of central wavelength is indicated by formula (13), when far from centre wavelength, is located at central wavelength lambda0The maximum phase tune at place
Value processed isCorresponding grey scale value is 512, then when in λ0Corresponding gray value is m when the modulation value at place is 2 π1,Therefore,In the λ far from centre wavelengthmaxPlace, reaches the ash corresponding to the phase modulation values of 2 π
Angle value isThen there is following relationship (15)：
Therefore the resolution ratio of edge wavelength isWherein Centered on maximum phase at wavelength
Modulation value, m1Corresponding gray value when the phase modulation values of wavelength are 2 π centered on the meaning of expression.
Therefore the grey level difference table of comparisons under different wave length can be obtained, in the case of incident unknown wavelength, according to
The table of comparisons can find out corresponding wavelength value.
One prominent feature of this set test device is, since the driving voltage of liquid crystal on silicon is can to pass through programming Control
Accurately adjusting, data are handled also by software collection, so this covering device results acquisition automates, it can without manual intervention
Quasi real time to be controlled.
The response speed of liquid crystal on silicon is generally 50ms, when the response of the ripe high-speed silicon base fluid crystalline substance phase-modulation of the marketization
Between can be down to 7ms, compared to grating, the response time is significantly optimized.Simultaneously as phase adjusted is by program control
System realizes rather than Mechanical course or manually controls that the precision that analysis measures also is greatly improved.In addition, of the invention
In, the liquid crystal on silicon for phase-modulation is commercial space phase-modulator, and the analyzer of respective wavelength also holds with optical detector
Easily buying.Other wavelength Sensitive Apparatuses, such as grating are not needed.Meanwhile in actual mechanical process, liquid crystal on silicon can use
Reflective, transmission-type can also be used, this not will produce substantial influence for theoretical analysis model according to the present invention.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, all within the spirits and principles of the present invention made by all any modification, equivalent and improvement etc., should all include
Within protection scope of the present invention.
Claims (4)
1. a kind of wavelength resolution monitoring method based on liquid crystal on silicon, which is characterized in that include the following steps：
(1) liquid crystal on silicon is utilized to receive known signal light of the wavelength in its operating wavelength range；
(2) analyzer is set on the output light path of liquid crystal on silicon, detects the light signal strength I exported by analyzer；
(3) the phase modulation values γ for adjusting liquid crystal on silicon, makes it change within the scope of 0 to 2 π, obtains multigroup light corresponding with γ
Signal strength；
(4) according to this multigroup light signal strength corresponding with γ, the maximum of points γ corresponding with minimum point of I is found out, is obtained
Its corresponding gray level value, and then the grey level that the two points are calculated is poor；
(5) in the operating wavelength range of liquid crystal on silicon, the wavelength of known signal light is adjusted, step (3) and (4) are repeated,
The grey level obtained under different wave length is poor；
(6) utilize liquid crystal on silicon to receive unknown signaling light of the wavelength in its operating wavelength range, repeat step (3) and
(4), the grey level obtained under unknown signaling optical wavelength is poor, and the grey level under the different wave length that control step (5) obtains is poor,
The wavelength of unknown signaling light is obtained, achievees the purpose that wavelength detecting.
2. the wavelength resolution monitoring method based on liquid crystal on silicon as described in claim 1, which is characterized in that the step (3)
In, obtain three groups of light signal strengths corresponding with γ；In the step (4), utilizeIt solves
Obtain the phase difference in the directions amplitude b and p and the directions s in the directions amplitude a and s in the directions signal light pAnd then obtain I most
It is big to be worth point γ corresponding with minimum point.
3. the wavelength resolution monitoring method based on liquid crystal on silicon as described in claim 1, which is characterized in that the step (4)
In, according to this multigroup light signal strength corresponding with γ, the γ-I curves under signal light wavelength are drawn out, the maximum value of I is found out
Point γ corresponding with minimum point.
4. the wavelength resolution monitoring method based on liquid crystal on silicon as claimed any one in claims 1 to 3, which is characterized in that
The liquid crystal on silicon includes reflective or transmission-type liquid crystal on silicon.
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